Hi folks, I've been playing with my pocket wizards again just experimenting with exposures with one flash off camera and some light coming in from the window. This was quite a quick setup in the living room with no clear backgrounds, I have done a shot to demonstrate what was in the background (a couch!). I didn't have any willing subjects so I had to use my wii guitar.

I think ambient exposure was about 1/100 at 2.8 ISO400. From this I can now choose if the background can be blown out white or Black, obviously for a white background there also needs to be something lighting your subject or you would get a silhouette, in this case the light came from the window.

So to blow out the background I had my flash pointed at the ceiling at 1/4 power, my camera set to 2.8 ISO400, 1/200sec, the window light exposed the guitar and the flash blew out the background.
Now to make the background black I had to eliminate all ambient light so I set my camera to 1/200 (I couldn't go any quicker as this is the 5D's x-sync speed) ISO100 and f16. The drop in ISO and aperture would also reduce the effect of the flash. The flash was now lighting the guitar, it was still at 1/4 power but I set the zoom (on the flash) to 85mm to reduce the spread and had it coming in from about 45 degrees to the right, this was important as I didn't want any spill onto the background, not to mention the horrible sharp shadow it would have produced. Instead of increasing or decreasing the power of the flash I just changed the distance between flash and subject and thats about it.
I did a very minor tweak in lightroom to ensure the blacks were black and the whites were white but nothing else. Labels: Flash, Hints, light, off-camera, tips